Title: Study on gas migration law and influencing factors of gas drainage

Authors: Yi Wang; Chenguang Zhao; Bing Wu

Addresses: School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing 100083, China ' School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing 100083, China ' School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing 100083, China

Abstract: Gas drainage is the main measure of coal mine gas prevention and control. The analysis of the factors influencing gas drainage and the optimal design of drill holes are very important to the drainage effect. In this study, a fluid structure coupling model of coal seam gas based on stress equation and transfusion equation is established. The factors influencing gas drainage are extraction time, occurrence depth, extraction pressure and drill hole diameter. COMSOL software is used to simulate the different factors influencing gas drainage effect, and the distribution law of the gas pressure is obtained. Finally, the field monitoring of gas extraction in Yuwu mine was carried out which was compared with the simulation. The results show that the trend of model simulation data is consistent with that of the field data, thereby proving the accuracy of the model. The model can be used to further study the law of gas migration in the process of drainage and provide the basis for an optimal design of gas drainage. [Received: August 25, 2021; Accepted: March 14, 2022]

Keywords: gas extraction; gas migration law; numerical simulation; fluid structure coupling model; porosity; permeability; drilling optimisation design.

DOI: 10.1504/IJOGCT.2022.126831

International Journal of Oil, Gas and Coal Technology, 2022 Vol.31 No.4, pp.406 - 423

Received: 25 Aug 2021
Accepted: 14 Mar 2022
Published online: 08 Nov 2022 *

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